During chordate evolution, paired fins, jaws, swim bladder, amniotic egg, and four-chambered heart is the sequence structures arose (from earliest to most recent).
Chordates are thought to have evolved from a deuterostome ancestor (echinoderms, hemichordates, pogonophorans, etc.) due to similarities in embryonic development, coelom type, and larval stages. The earliest vertebrate fossils date back to the Silurian-Devonian period, approximately 400 million years ago.
Phylum Chordata is one of the Kingdom Animalia classifications. Chordata is distinguished by the presence of a notochord, a hollow nerve cord, and paired pharyngeal gills. They are bilaterally symmetric, with a cavity inside for true organs.
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